Well in 2.5 union mounts are going to go in right? Then you couldhave a compatibility "proc-compat" filesystem that reads data from/kernel and supplies it in backwards compatible formats such as/proc/mounts, that you union-mount over /proc

And in 2.7, rm -rf linux/fs/proc-compat

Mike.-- "Only two things are infinite, the universe and human stupidity, and I'm not sure about the former" -- Albert Einstein.